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Cash and cash equivalents and Investments and Additional information on the consolidated statements of cash flows - Changes in assets/liabilities components (Details) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net decrease (increase) in assets |  |  |
Trade receivables | $ (2,072) | $ (2,773) | $ (2,364)
Other receivables | (902) | 276 | (754)
Inventories | (618) | 837 | (1,522)
Total | (3,592) | (1,660) | (4,640)
Net increase (decrease) in liabilities |  |  |
Trade payables | 1,067 | (1,391) | 1,368
Deferred revenues | 51 | (58) | (48)
Salaries and social security payables | 513 | 369 | 221
Other taxes payables | 982 | 13 | 483
Other liabilities | 68 | 62 | 29
Provisions (Note 17) | (360) | (174) | (163)
Total | $ 2,321 | $ (1,179) | $ 1,890

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